BoilerFaultCodesYour boiler's internal computer has encountered a software glitch or a technical hiccup and needs a system restart to try and clear the error.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Printed circuit board (PCB) error – try resetting the boiler
What causes this fault?
This fault occurs when the boiler's main control board experiences a communication failure or a data processing error within its internal memory. It is often caused by a sudden electrical surge, loose wiring connections, or the natural degradation of the electronic components on the circuit board over time.
DIY fix possible
Locate the Reset button on the boiler control panelPress and hold the Reset button for 2-3 secondsWait for the boiler to complete its startup sequence and check if the code clears
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like E1-73 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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